19477448609 has 4 divisors (see below), whose sum is σ = 19478297220. Its totient is φ = 19476600000.

The previous prime is 19477448567. The next prime is 19477448621. The reversal of 19477448609 is 90684477491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90684477491 = 43 ⋅2108941337.

It can be written as a sum of positive squares in 2 ways, for example, as 1613789584 + 17863659025 = 40172^2 + 133655^2 .

It is a cyclic number.

It is not a de Polignac number, because 19477448609 - 2¹⁶ = 19477383073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19477448699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388892 + ... + 436109.

It is an arithmetic number, because the mean of its divisors is an integer number (4869574305).

Almost surely, 2^19477448609 is an apocalyptic number.

It is an amenable number.

19477448609 is a deficient number, since it is larger than the sum of its proper divisors (848611).

19477448609 is an equidigital number, since it uses as much as digits as its factorization.

19477448609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848610.

The product of its (nonzero) digits is 12192768, while the sum is 59.

The spelling of 19477448609 in words is "nineteen billion, four hundred seventy-seven million, four hundred forty-eight thousand, six hundred nine".